| Povoa de Varzim to Silver Firs (Washington) | 5,052.12 mi (8,130.60 km) |
| Povoa de Varzim to Silver Spring (Maryland) | 3,510.00 mi (5,648.81 km) |
| Povoa de Varzim to Silver Springs Shores (Florida) | 4,097.43 mi (6,594.17 km) |
| Povoa de Varzim to Silverdale (Washington) | 5,079.37 mi (8,174.46 km) |
| Povoa de Varzim to Silverton (Oregon) | 5,211.98 mi (8,387.87 km) |
| Povoa de Varzim to Simi Valley (California) | 5,581.34 mi (8,982.30 km) |
| Povoa de Varzim to Simpsonville (South Carolina) | 3,904.52 mi (6,283.71 km) |
| Povoa de Varzim to Sioux City (Iowa) | 4,283.89 mi (6,894.25 km) |
| Povoa de Varzim to Sioux Falls (South Dakota) | 4,260.61 mi (6,856.79 km) |
| Povoa de Varzim to Skokie (Illinois) | 3,916.88 mi (6,303.61 km) |
| Povoa de Varzim to Sleepy Hollow (New York) | 3,298.55 mi (5,308.50 km) |
| Povoa de Varzim to Slidell (Louisiana) | 4,438.93 mi (7,143.77 km) |
| Povoa de Varzim to Smithfield (North Carolina) | 3,685.73 mi (5,931.60 km) |
| Povoa de Varzim to Smithfield (Utah) | 4,951.76 mi (7,969.09 km) |
| Povoa de Varzim to Smithville (Missouri) | 4,317.90 mi (6,948.99 km) |
